A sample of gas at temperature T is adiabatically expanded to double its volume. The work done by the gas in the process is (given, γ = 3/2):
(1) W = TR [√2 - 2]
(2) W + T/R [√2 - 2]
(3) W = R/T [2 - √2]
(4) W = RT [2 - √2]